<http://schema.org/description>
"How does Google create more ad inventory when there is only so much growth in web or mobile search?  Well, AdSense was one way - serving up ads based on contextual relevancy.  But there are only so ma"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-contextual-discovery-12639.html>